Garodar say:
"Its workign properly. Abilities such as incinerate and fel flame consume about 9-10% of your mana. If you spam fel flame or incinerate, its normal to go oom, because no haste. Issue solved."
I have 30% haste on destro lock and i get out of mana... think about no haste destro locks.
http://prntscr.com/83rsy0 ---> 13k mana on destro, this is normal?
http://prntscr.com/83rvb3 ---> 30% haste and i get on 8k mana?
Because no haste = not solved problem
at one point fighting i get on low mana all time, says Out of mana, incinerate and other spells get in grey during 2s almost